CVE-2026-21535
Microsoft Teams Information Disclosure Vulnerability
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Teams Information Disclosure Vulnerability
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
- Record
CVE-2026-21535- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C - Weakness
- CWE-284
- Updated
- 2026-11-02
EUVDEUVD-2026-7572
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
- Record
EUVD-2026-7572- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-rx38-cw65-cmwp
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose...
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
- Record
GHSA-rx38-cw65-cmwp- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
NVD
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
- Record
CVE-2026-21535- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-21535 is a high vulnerability (CVSS 8.2) in Microsoft Teams, published February 19, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.65%, the 51st percentile. No source names a fixed version.